<template>
    <div class="cart">
        <h4>全部商品</h4>
        <div class="cart-main">
            <div class="cart-th">
                <div class="cart-th1">全部</div>
                <div class="cart-th2">商品</div>
                <div class="cart-th3">单价（元）</div>
                <div class="cart-th4">数量</div>
                <div class="cart-th5">小计（元）</div>
                <div class="cart-th6">操作</div>
            </div>
            <div class="cart-body">
                <ul class="cart-list" v-for="item in cartInfoList" :key="item.id">
                    <li class="cart-list-con1">
                        <input
                            type="checkbox"
                            name="chk_list"
                            :checked="item.isChecked"
                            @click="changeCartChecked(item.skuId, item.isChecked)"
                        />
                    </li>
                    <li class="cart-list-con2">
                        <img :src="item.imgUrl" />
                        <div class="item-msg">{{ item.skuName }}</div>
                    </li>
                    <li class="cart-list-con3">
                        <div class="item-txt">语音升级款</div>
                    </li>
                    <li class="cart-list-con4">
                        <span class="price">{{ item.cartPrice }}</span>
                    </li>
                    <li class="cart-list-con5">
                        <a href="javascript:void(0)" class="mins" @click="changeCartNum(item.skuId, item.skuNum - 1)">
                            -
                        </a>
                        <input
                            autocomplete="off"
                            type="text"
                            :value="item.skuNum"
                            minnum="1"
                            class="itxt"
                            @change="changeCartNum(item.skuId, $event.target.value)"
                        />
                        <a href="javascript:void(0)" class="plus" @click="changeCartNum(item.skuId, item.skuNum + 1)">
                            +
                        </a>
                    </li>
                    <li class="cart-list-con6">
                        <span class="sum">{{ item.cartPrice * item.skuNum }}</span>
                    </li>
                    <li class="cart-list-con7">
                        <a href="#none" class="sindelet" @click="deleteCart(item.skuId)">删除</a>
                        <br />
                        <a href="#none">移到收藏</a>
                    </li>
                </ul>
            </div>
        </div>
        <div class="cart-tool">
            <div class="select-all">
                <input class="chooseAll" type="checkbox" :checked="isAllChecked" @click="changeCartCheckedAll" />
                <span>全选</span>
            </div>
            <div class="option">
                <a href="#none" @click="deleteCheckedCart">删除选中的商品</a>
                <a href="#none">移到我的关注</a>
                <a href="#none">清除下柜商品</a>
            </div>
            <div class="money-box">
                <div class="chosed">
                    已选择
                    <span>{{ checkedCount }}</span>
                    件商品
                </div>
                <div class="sumprice">
                    <em>总价（不含运费） ：</em>
                    <i class="summoney">{{ sumPrice }}</i>
                </div>
                <div class="sumbtn">
                    <router-link to="/trade" class="sum-btn">结算</router-link>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import {
    reqAddOrUpdateShopCart,
    reqCheckAllCart,
    reqCheckCart,
    reqDeleteCart,
    reqDeleteCheckedCart,
    reqShopCartList,
} from "@/api";

export default {
    name: "ShopCart",
    data() {
        return {
            cartInfoList: [],
            skuNum: 1,
        };
    },
    mounted() {
        this.getShopCartList();
    },
    methods: {
        // 获取购物车列表
        async getShopCartList() {
            const result = await reqShopCartList();
            this.cartInfoList = result[0]?.cartInfoList || [];
        },
        // 更改购物车商品数量
        async changeCartNum(skuId, skuNum) {
            // 点击加号或者减号时,由于服务器响应时间较长,所以会出现用户点击加号或者减号时,页面上的数量还没有改变,就已经发送请求了,所以会出现页面上的数量和服务器上的数量不一致的情况
            // 解决方案:在发送请求之前,先修改页面上的数量,然后再发送请求,这样就不会出现页面上的数量和服务器上的数量不一致的情况

            this.skuNum = skuNum; // 修改页面上的数量
            if (this.skuNum <= 1) return; // 如果页面商品数量小于1，直接返回

            // 因为后端接口问题 skuNum是我们希望变成的数量,但是请求中要的是前后的差值数量
            //我们需要知道之前的数量,然后进行计算
            //我们只能通过当前的skuId找到当前商品原始的数量
            const cartInfo = this.cartInfoList.find(item => item.skuId === skuId);
            try {
                await reqAddOrUpdateShopCart(skuId, skuNum - cartInfo.skuNum);
                await this.getShopCartList();
            } catch (e) {
                console.log(e.message);
            }
        },
        // 更改购物车商品选中状态(isChecked为1代表选中,0代表未选中)
        async changeCartChecked(skuId, isChecked) {
            try {
                await reqCheckCart(skuId, isChecked ? 0 : 1);
                await this.getShopCartList();
            } catch (e) {
                console.log(e.message);
            }
        },
        // 全选
        async changeCartCheckedAll() {
            // 1.获取当前全选框的选中状态
            const isChecked = this.isAllChecked;
            // 2.获取所有商品的skuId
            const skuIds = this.cartInfoList.map(item => item.skuId);
            // 3.调用接口
            try {
                await reqCheckAllCart(isChecked ? 0 : 1, skuIds);
                await this.getShopCartList();
            } catch (e) {
                console.log(e.message);
            }
        },

        // 删除购物车商品
        async deleteCart(skuId) {
            try {
                await reqDeleteCart(skuId);
                await this.getShopCartList();
            } catch (e) {
                console.log(e.message);
            }
        },
        // 删除选中的商品
        async deleteCheckedCart() {
            // 1.获取所有选中的商品的skuId
            const skuIds = this.cartInfoList.filter(item => item.isChecked === 1).map(item => item.skuId);
            // 2.调用接口
            try {
                await reqDeleteCheckedCart(skuIds);
                await this.getShopCartList();
            } catch (e) {
                console.log(e.message);
            }
        },
    },
    computed: {
        // 总价(根据选中状态)
        sumPrice() {
            return this.cartInfoList.reduce((pre, item) => {
                if (item.isChecked) {
                    return pre + item.cartPrice * item.skuNum;
                } else {
                    return pre;
                }
            }, 0);
        },
        // 是否全选
        isAllChecked() {
            return this.cartInfoList.every(item => item.isChecked) && this.cartInfoList.length > 0;
        },
        // 选中的商品数量
        checkedCount() {
            return this.cartInfoList.reduce((pre, item) => {
                if (item.isChecked) {
                    return pre + item.skuNum;
                } else {
                    return pre;
                }
            }, 0);
        },
    },
};
</script>

<style lang="less" scoped>
.cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
        margin: 9px 0;
        font-size: 14px;
        line-height: 21px;
    }

    .cart-main {
        .cart-th {
            background: #f5f5f5;
            border: 1px solid #ddd;
            padding: 10px;
            overflow: hidden;

            & > div {
                float: left;
            }

            .cart-th1 {
                width: 25%;

                input {
                    vertical-align: middle;
                }

                span {
                    vertical-align: middle;
                }
            }

            .cart-th2 {
                width: 25%;
            }

            .cart-th3,
            .cart-th4,
            .cart-th5,
            .cart-th6 {
                width: 12.5%;
            }
        }

        .cart-body {
            margin: 15px 0;
            border: 1px solid #ddd;

            .cart-list {
                padding: 10px;
                border-bottom: 1px solid #ddd;
                overflow: hidden;

                & > li {
                    float: left;
                }

                .cart-list-con1 {
                    width: 4.1667%;
                }

                .cart-list-con2 {
                    width: 25%;

                    img {
                        width: 82px;
                        height: 82px;
                        float: left;
                    }

                    .item-msg {
                        float: left;
                        width: 150px;
                        margin: 0 10px;
                        line-height: 18px;
                    }
                }

                .cart-list-con3 {
                    width: 20.8333%;

                    .item-txt {
                        text-align: center;
                    }
                }

                .cart-list-con4 {
                    width: 12.5%;
                }

                .cart-list-con5 {
                    width: 12.5%;

                    .mins {
                        border: 1px solid #ddd;
                        border-right: 0;
                        float: left;
                        color: #666;
                        width: 6px;
                        text-align: center;
                        padding: 8px;
                    }

                    input {
                        border: 1px solid #ddd;
                        width: 40px;
                        height: 33px;
                        float: left;
                        text-align: center;
                        font-size: 14px;
                    }

                    .plus {
                        border: 1px solid #ddd;
                        border-left: 0;
                        float: left;
                        color: #666;
                        width: 6px;
                        text-align: center;
                        padding: 8px;
                    }
                }

                .cart-list-con6 {
                    width: 12.5%;

                    .sum {
                        font-size: 16px;
                    }
                }

                .cart-list-con7 {
                    width: 12.5%;

                    a {
                        color: #666;
                    }
                }
            }
        }
    }

    .cart-tool {
        overflow: hidden;
        border: 1px solid #ddd;

        .select-all {
            padding: 10px;
            overflow: hidden;
            float: left;

            span {
                vertical-align: middle;
            }

            input {
                vertical-align: middle;
            }
        }

        .option {
            padding: 10px;
            overflow: hidden;
            float: left;

            a {
                float: left;
                padding: 0 10px;
                color: #666;
            }
        }

        .money-box {
            float: right;

            .chosed {
                line-height: 26px;
                float: left;
                padding: 0 10px;
            }

            .sumprice {
                width: 200px;
                line-height: 22px;
                float: left;
                padding: 0 10px;

                .summoney {
                    color: #c81623;
                    font-size: 16px;
                }
            }

            .sumbtn {
                float: right;

                a {
                    display: block;
                    position: relative;
                    width: 96px;
                    height: 52px;
                    line-height: 52px;
                    color: #fff;
                    text-align: center;
                    font-size: 18px;
                    font-family: "Microsoft YaHei";
                    background: #e1251b;
                    overflow: hidden;
                }
            }
        }
    }
}
</style>
